The present invention relates to a concrete-filled steel column in which a steel tube is filled with concrete and, more specifically, to an octagonal concrete-filled steel column in which four unit steel plates are coupled to each other at the edges thereof such that a steel tube forms an octagonal shape as a whole, thereby achieving economical construction and facilitating the design of a connection part that is connected to a beam. The octagonal concrete-filled steel column of the present invention relates to a concrete-filled steel column in which a steel tube is filled with concrete, wherein the steel tube is formed by coupling four unit steel plates, and each of the unit plates includes a flat portion and coupling portions that are bent to be inclined with respect to the opposite ends of the flat portion and are coupled to adjacent unit plates such that the steel tube forms an octagonal shape as a whole.
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